The city of Basel has one such river tunnel running under the city and 1,4km of this tunnel was in need of maintenance and the tunnel entrance needed enlargement to increase the maintenance challenges in the river tunnel.

Their goal was to funnel the incoming river water along one side of the tunnel to make a dry and safe zone where maintenance and repairs could be done. And they require a solution which would stay functioning for the entirety of the maintenance project, which was planned to take two years.


AquaFence was provided with a wide range of drawings of the tunnel, which helped us grasp the layout and various challenges throughout the tunnel. We conducted two site reviews to ensure all details and challenges were orderly considered and documented.

To fully protect the workers against the fast moving river water, AquaFence delivered a combination of standard barriers and custom engineered Barriers.

The project was cost optimized and AquaFence delivered 200 meters of flood mitigation equipment to the city of Basel. This allowed the project to be done in seven stages, tackling 200 meters of maintenance at the time.


The high safety margins in the AquaFence product design allowed the maintenance works to work safely from the several cubic meters of water running through the tunnel every second, and the simplicity of the product made it easy for the workers to understand and operate the flood barriers.